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| TEST STUDY ON INFLUENCE OF IMMERSION ON EARTH PRESSURE AND HORIZONTAL DISPLACEMENT OF HIGH SLOPE OF UNSATURATED INTACT LOESS |
| (1.School of Civil Engineering，Lanzhou University of Technology，Lanzhou，Gansu 730050，China；2. Department of Architectural Engineering，Logistical Engineering University of PLA，Chongqing 400041，China ) |
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Abstract By the field test，influences of immersion on the top of slope about earth pressure of unsaturated intact loess and displacement of free face of slope are studied. The results show that：(1) When the top of slope is soaked，the earth pressure strength increases rapidly；the maximum earth pressure strength of the soaked slope is 4 times of intact slope before the slope landslide. (2) After the slope landslide，shear outlet of landslide is at the one third of the slope height rather than the toe of slope. (3) Earth pressure strength of unsaturated intact loess is mainly produced by residual downslide thrust. (4) The displacement of free face of slope which is nonlinear relationship with earth pressure and the displacement of free face of slope is not caused by earth pressure. (5) In the process of water immersion，changing process of earth pressure can be divided into three stages：the first stage is changing stage of mechanical properties of slide earth body；the second stage is integral slippage stage of slide earth body；the third stage is integral deformation stage of slide earth body. (6) For the vertical cut slope of unsaturated intact loess，ultimate alarming value of the horizontal displacement is 10 mm；if the horizontal displacement of vertical cut slope is more than 10 mm，the slope would probably evolve into a landslide.
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Received: 27 September 2010
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2011, Vol. 30 
